Dental instrument



Se t; 18, 1923; 1,468,063

-' L. WEINSTEIN DENTAL INSTRUMENT Filed June 10, 1922 2 Sheets-Sheet 1 IIIUIIIIIIIIIIIIIIIIIIIIIH 0 -4 Ina/6762507: loads fwec'n6&c'7o,

' Sept.

' 1,468,$3 J. WEINSTEIN DENTAL INSTRUMENT Filed June 10. 1922 2 Sheets-Sheet 2 Patented ept 18, 1923;

F Pi -3 ihetdeea ,p w SEATES ma'r avarice tours J. wEINsrEIn,

OF NEVVYORK, N. Y.

DENTAL INSTRUMENT.

- "Application filed June 16,

To whomif'iizay concern 7 Be it known-that I,LoUIs l wniNsrn-m,

a citizen of the. United States,residing at New Yorlnin the county of New York and State of New York, have invented certain new and useful Improvements in Dental In struments, of whichthe following is a specification. v o 7 j The invention relates to a dental appliance l0 and specifically to an instrument by means ot which certain types of artificial denture attachments maybe rapidly and accurately charted andatta'ched tothe denture.

The new appliance is intended .particu 1151311 for charting the positions of clasps used as-attachments for various types of removable dental or oral restorations, and principally insuchcases in which the abutments, that is, the; natural vteeth to which thewclasps are attached, are out of alignanent. V p 1 In many cases in Whichan artifi c-ialden tureisfrequired', and particularly where the teeth to be-replaced'have been missing for alonmtimc the remainin teeth used as su h 7 in.

-ports for artificial-dentures; tend to move from: the conventional lines of the dental arch. the result being that the vertical: axes of these abutments are considerably disse -placed with respect'to each other; lflunder these conditions, a denture is provided which is to be secured to theabutments bymeans of clasps or the like, it will be obvious thatiif theseclaspsare made "for and fitted n individually to each of the two, three or ;--'more abutments as closelyand accurately as .i required, itwillbedmpossihle to insert the denture in position on -thejaw by reasonof the relative displacement of the abutments.

I m; Thiscondition is completelyremedied by 1922. Serial No. 567,482.

drawings which illustrate a practical embodiment of-the invention by way of example of which. the forms, dimensions and constructional details may be varied without exceeding the scope of the invention. On said drawings: r

Fig. 1 is an elevation of the assembled appa-ratus.

F ig. 2 is a top plan thereof 7 Fig. 3 is a section on line 3-3 01? Fig. 2.

Fig. 4 is an end elevation of the device, for retaining the marking means while forming the straight edge thereof.

F ig. 5 is a side elevation of the retaining device.

Figs. 6, 7 and 8 show various 'ahutments in elevation, illustrating the method of charting the positions for the clasps.- 7

Referring to'said figures of the accompanying drawing, 10 represents a hasc suitably supported as by Feet 1'1, and on which is mounted in suitablemanner. by screws -or otherwise, as at 11, a support 19, which maybe provided with an expanded portion 12 forming: a hand rest, and having the transverseportion 13 extending therefrom The free end of the latter is provided with a retaining or clamping device actuated by means of a spring and a set screw in which retaining device is held a rotatable and vertically adjustable charting rod 14, one end of which is provided with a knurledhead' lfiflthe other end having a transverse slot 'l4l3i f01. the reception of a marking; instrument 16, for example, lead. crayon or the like. which isof rectangularcross section;

and-the end'ofthis bar 14- is threaded towrecer've 'alset screw'l7 torrctainlngthe lead 16 n ad usted position.

-Tlie retaining mechanism onthe part? 13 (BOHIPIISGS the block 18, rigidlyattached to or integral with said arm 13, and provided ;with a longitudinal angular groove 19 for the reception of the Charting: rod let. and aOlip'QO, pivoted as at 21, the tree end of -whichfengaees the rod lt and is held in ongagenienttherewith by means of the spiral spring 22 seated in the notches 23 and 24 of the 'members 13 'and'QO respectively, said spring 22 tending to-force the inner end of the clip 20 outwardly and thus to apply the outer end against the rod 1% in the angular groove 1.9. The rod 14.- maybe adjusted rod 14. V a V A modelsupport 26, freely movable on the surface of the base plate 10, is provided- With a model plate 27, which is adjustable at substantially any suitable angle with respect to the support 26 and the base-plate 10, by means offa'universal or ball and "socketjoint (not shown) which connects 1 the members 26 and 527; andthe plate 27 may be retained in adjusted position by means of the set screw 28 provided-on he 'model support and engaging the ball and 7 socket joint.

A model 29 (in the present case one of a lower :lflW), of. plaster of Paris material, inetal orthe like'ffor example, is "mounted on the plate 27 in the manner and s for the purpose hereinafter described.

The clasp charting technique is as follows: 4

. If an artificial denture such, for example,

5 as that illustrated, is to be constructed, the

'model 29 having the abutments 30 and 31', for example, is temporarily attached to the model plate 27 by means of melted Wax,

shellac or the like, said plate 27 being pro-u vided with a corrugated or roughened surface forretaining the adhesive waxjetz-v. and

the base of the modelv 29 may also he corro- "spoudingly roughened for this purpose.

Referring to Fig; 1, it will be noted that theabutment 31 is substantially out of alignment with the remaining teeth, and

that therefore if clasp attachments were made separately for and accurately fitted to each abutment in the usual manner, it would be impossible to insert the denture in posi 1 tion on the jaw. By the use of the instru- .m'ent forming the subject of tho pl'ese nt 'invention the pos tion of each clasp is charted the other or others,.by'adjusting the model simultaneously Vand'jin parallel relationito i pla'te ZZso that the model29 thereon will be at the angle" considered most -'si1ita-ble and convenient for insertion of the denti'ireon the jaivyancl adjusting'th'e charting bill 14: in height so as-t'o contact with the-extreme contesiities of theiabutmcnts, and then moi 1 ing the support 26 about on the base 110 so that all portions of the extreme convexities of the .abutments 30, 31, etc. come in contact With the longitudinal straight marking edge of, the lead 16" or the like attached inthe charting. rodll. This moving contact of the abutments against the straight edge of the marking lead will mark the extreme-com vex portions of each abutment and accurately indicate the positions of the clasps in perfect relative parallel alignment, as by the line 32 on abutment 30 and line 33 on abutment 31, for example (Fig. 1'), where.- upon the general form of the clasp canbe 35, 36, Figs. 6, 7, 8. 'The positions of charted and; the forms indicated as set forth 1 above, the clasps are modeled in w s or the ,like and" cast or otherwise sformed the usual manner.?

-' The model*29.may'be removed' from the plate 27 by slightly'heating the latter,;thereby softening the WZIX,"-Sl1Gll2lC "oroth'eradhesive substance connecting these members,

,The claspsj; are then mounted on-the same or another model and thedenture completed in the usual manner. llVhen the denture With the" clasps is completed, each clasp will be parallel 'Wlth 'respect tlo' the other or others at the proper angle of'insertion, and the denture may bepositioned with facility and accuracy.

be perfectly straightg and Figs; 4 and 5 illustrate a device'in Whiohithe lead marking means 16 is retained While" the "straight edge is formed thereon. knurled bar 40, of hardened steel; or the like, is: provided with a longitudinal groove 4-1, in Whichthe lead 16 fits'accurately, andis held in said V groove 41 by pressure of" the operators thumb, for example, in the notch 42, the

straight edgefof; the lead lti then being formed-with a'file or the lilteat the end of the bar 4 0, as shown. on Fig.4. r

As stated above, the-forms, dimensions and details of construction may be modified without"departingfrom thescope of the in 'i'ention. For example; the supportingrmeme her 12, with the transverse arm' 13" and its 7 pertinent mechanism, instead ofb'eing permanently or otherwise attached to the base the clasps having been 7 r It is absolutely necessary that mark- 7 ingedge of the'lead, crayon or the like 16 indicated asshovvn by the dotted lines 34:, r

"10, maybe"supporteda separately. The api pliancc may also be used -withoutthemodel support '26 in suchcasesjwhere it may not be necessary to adjustfthe model at adefinite angle-bf insertion, for the same'or other purpose, IIiWlllCll fCilSG the'mo'delma y bemoved frcelyronwithejbase 10. V f lVhatI claim is:'

member and extending parallel with and 'above'said base member, a spring andscrew actuated clamping device provided at the free end of said arm,a hollow-rod engaged and vertically and rotatably adjustable in 7 said clamping device, a transverse slot prol v cled n the ower end of said rod, the'di iLjdental instrumentcomprisingin com 77 binatioii a base member,-i'a rigidupright i member mounted'atfanLendof said base member, an arm integral .vvith" said upright llO mensions of said slot being modified b means of an adjusting screw threaded in the lower end of said rod astraight edge marking means extending longitudinally through 5 said slot and retained in position by said screw, and a universally adjustable model support having a'dental model thereon sepy arate from and freely movable on said base member about and in contact with said marking means, whereby the extreme con- 10 vexities of the teeth on saiddental model are charted.

In testimony whereof I aflix my signature.

LOUIS J. WEINSTEIN. 

